gilgais                 package:MASS                 R Documentation

_L_i_n_e _T_r_a_n_s_e_c_t _o_f _S_o_i_l _i_n _G_i_l_g_a_i _T_e_r_r_i_t_o_r_y

_D_e_s_c_r_i_p_t_i_o_n:

     This dataset was collected on a line transect survey in gilgai
     territory in New South Wales, Australia.  Gilgais are natural
     gentle depressions in otherwise flat land, and sometimes seem to
     be regularly distributed. The data collection was stimulated by
     the question: are these patterns reflected in soil properties?  At
     each of 365 sampling locations on a linear grid of 4 meters
     spacing, samples were taken at depths 0-10 cm, 30-40 cm and 80-90
     cm below the surface. pH, electrical conductivity and chloride
     content were measured on a 1:5 soil:water extract from each
     sample.

_U_s_a_g_e:

     data(gilgais)

_F_o_r_m_a_t:

     This data frame contains the following columns:

     '_p_H_0_0' pH at depth 0-10cm

     '_p_H_3_0' pH at depth 30-40cm

     '_p_H_8_0' pH at depth 80-90cm

     '_e_0_0' electrical conductivity in mS/cm  (0-10 cm)

     '_e_3_0' electrical conductivity in mS/cm (30-40 cm)

     '_e_8_0' electrical conductivity in mS/cm (80-90 cm)

     '_c_0_0' chloride content in ppm  (0-10 cm)

     '_c_3_0' chloride content in ppm (30-40 cm)

     '_c_8_0' chloride content in ppm (80-90 cm)

_S_o_u_r_c_e:

     Webster, R. (1977) Spectral analysis of gilgai soil. _Australian
     Journal of Soil Research_ *15*, 191-204.

     Laslett, G. M. (1989) Kriging and splines: An empirical comparison
     of their predictive performance in some applications (with
     discussion). _Journal of the American Statistical Association_
     *89*, 319-409

_R_e_f_e_r_e_n_c_e_s:

     Venables, W. N. and Ripley, B. D. (2002) _Modern Applied
     Statistics with S._ Fourth edition.  Springer.

